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Paul McCartney‘s list of hits runs deep, so it’s not often that he deviates from the classics.

But audience members at London’s O2 Arena were treated to an even more special McCartney show when the former Beatle played a rare, unexpected song as part of the setlist.

Five songs into his set, Macca debuted “Temporary Secretary,” a cut from his experimental, synth-heavy second solo album, McCartney II. The premiere was even more unexpected since it came after he played more obvious tracks like the Beatles’ “Eight Days a Week” and”Can’t Buy Me Love,” the Wings song “Listen to What the Man Said” and his solo track “Save Us.”

That wasn’t the only surprise during his 40-song set, though. When he was winding down his first encore with the Beatles’ “I Saw Her Standing There,” Macca had help from Dave Grohl, who’s recently become a pro at singing other artist’s songs.